Tools & Wizards About Us
training.51cto.com screenshot

Report Summary

  • 54

    Performance

    Renders faster than
    72% of other websites

  • 70

    Accessibility

    Visual factors better than
    that of 36% of websites

  • 75

    Best Practices

    More advanced features
    available than in
    36% of websites

  • 75

    SEO

    Google-friendlier than
    32% of websites

training.51cto.com

51CTO精品班-领先的IT职业在线培训平台（原51CTO微职位全新升级）

Page Load Speed

40.7 sec in total

First Response

10.4 sec

Resources Loaded

29.2 sec

Page Rendered

1.1 sec

training.51cto.com screenshot

About Website

Click here to check amazing Training 51 Cto content for China. Otherwise, check out these important facts you probably never knew about training.51cto.com

51CTO精品班（原51CTO微职位）是依托51CTO 15年行业品牌、1800万IT技术用户建立的专业IT职业在线培训平台，涵盖软考培训、PMP项目管理培训、华为认证培训、红帽认证培训等IT认证考试培训，以及Python、Java、大数据、区块链等IT技能就业培训领域，采用名师授课、录播直播互动、随到随学、通关学习、一对一辅导模式，帮助学员系统、全面、高效学习，助力职场竞争力提升！

Visit training.51cto.com

Key Findings

We analyzed Training.51cto.com page load time and found that the first response time was 10.4 sec and then it took 30.3 sec to load all DOM resources and completely render a web page. This is an excellent result, as only a small number of websites can load faster.

Performance Metrics

training.51cto.com performance score

54

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value5.0 s

10/100

10%

LCP (Largest Contentful Paint)

Value6.2 s

11/100

25%

SI (Speed Index)

Value11.7 s

4/100

10%

TBT (Total Blocking Time)

Value20 ms

100/100

30%

CLS (Cumulative Layout Shift)

Value0

100/100

15%

TTI (Time to Interactive)

Value7.5 s

48/100

10%

Network Requests Diagram

training.51cto.com

10404 ms

jsr_px.css

4806 ms

art_master_top.css

1851 ms

index_1_down.js

2232 ms

allmobilize.min.js

17572 ms

Our browser made a total of 66 requests to load all elements on the main page. We found that 8% of them (5 requests) were addressed to the original Training.51cto.com, 33% (22 requests) were made to Images.51cto.com and 6% (4 requests) were made to 51cto.com. The less responsive or slowest element that took the longest time to load (17.6 sec) relates to the external source A.yunshipei.com.

Page Optimization Overview & Recommendations

Page size can be reduced by 278.5 kB (42%)

Content Size

657.3 kB

After Optimization

378.9 kB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Training.51cto.com main page is 657.3 kB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 20% of websites need less resources to load. Javascripts take 360.8 kB which makes up the majority of the site volume.

HTML Optimization

-75%

Potential reduce by 29.6 kB

  • Original 39.3 kB
  • After minification 36.6 kB
  • After compression 9.7 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. HTML code on this page is well minified. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 29.6 kB or 75% of the original size.

Image Optimization

-10%

Potential reduce by 23.1 kB

  • Original 242.8 kB
  • After minification 219.7 kB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Training 51 Cto images are well optimized though.

JavaScript Optimization

-59%

Potential reduce by 214.1 kB

  • Original 360.8 kB
  • After minification 352.9 kB
  • After compression 146.7 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 214.1 kB or 59% of the original size.

CSS Optimization

-81%

Potential reduce by 11.7 kB

  • Original 14.4 kB
  • After minification 12.8 kB
  • After compression 2.7 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Training.51cto.com needs all CSS files to be minified and compressed as it can save up to 11.7 kB or 81% of the original size.

Requests Breakdown

Number of requests can be reduced by 35 (59%)

Requests Now

59

After Optimization

24

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 59 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Training 51 Cto. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests from 17 to 1 for JavaScripts and as a result speed up the page load time.

Network Requests Diagram

training.51cto.com

training.51cto.com

10404 ms

jsr_px.css

jsr_px.css

4806 ms

art_master_top.css

art_master_top.css

1851 ms

index_1_down.js

index_1_down.js

2232 ms

allmobilize.min.js

allmobilize.min.js

17572 ms

jquery-1.8.3.min.js

jquery-1.8.3.min.js

1437 ms

head_art_more1.js

head_art_more1.js

1877 ms

ga.js

ga.js

12 ms

top_bg_xian.gif

top_bg_xian.gif

879 ms

nav_ico1.gif

nav_ico1.gif

398 ms

wKioL1ZJmW6h-biqAAH-gFnd4XU858.jpg

wKioL1ZJmW6h-biqAAH-gFnd4XU858.jpg

16489 ms

wKiom1ZJmBHi6-5HAADWiqrwWmA015.jpg

wKiom1ZJmBHi6-5HAADWiqrwWmA015.jpg

10155 ms

__utm.gif

__utm.gif

29 ms

top_shequ.gif

top_shequ.gif

1347 ms

143749870.gif

143749870.gif

370 ms

peixun_logo.gif

peixun_logo.gif

388 ms

ico1.gif

ico1.gif

727 ms

so.gif

so.gif

407 ms

1295598033peixun3.jpg

1295598033peixun3.jpg

6523 ms

ico2.gif

ico2.gif

1303 ms

ico3.gif

ico3.gif

2454 ms

183705747.jpg

183705747.jpg

1995 ms

172335540.jpg

172335540.jpg

10271 ms

1295598071peixun4.jpg

1295598071peixun4.jpg

15931 ms

c.js

c.js

1067 ms

copy_right.js

copy_right.js

369 ms

count.js

count.js

908 ms

randm.js

randm.js

43 ms

index.php

index.php

581 ms

top_bg.gif

top_bg.gif

812 ms

51.gif

51.gif

382 ms

ico2.gif

ico2.gif

455 ms

ico3.gif

ico3.gif

853 ms

peixun_bg.gif

peixun_bg.gif

763 ms

peixun_bg1.gif

peixun_bg1.gif

8137 ms

px_bg4.gif

px_bg4.gif

804 ms

px_bg41.gif

px_bg41.gif

796 ms

px_bg5.gif

px_bg5.gif

1125 ms

top_bg3.gif

top_bg3.gif

3338 ms

px_bg6.gif

px_bg6.gif

1271 ms

px_bg7.gif

px_bg7.gif

1493 ms

px_bg8.gif

px_bg8.gif

1623 ms

link_bg1.gif

link_bg1.gif

1726 ms

ncym

ncym

1034 ms

analytics.js

analytics.js

12 ms

collect

collect

35 ms

collect

collect

81 ms

ncym

ncym

709 ms

adPic.new.20150909.min.js

adPic.new.20150909.min.js

64 ms

bot-patch.min.js

bot-patch.min.js

72 ms

click.min.js

click.min.js

74 ms

adx.php

adx.php

2142 ms

rBEhWlJYrAEIAAAAAAACetYAYQwAAECuwP__W4AAAKS951.png

rBEhWlJYrAEIAAAAAAACetYAYQwAAECuwP__W4AAAKS951.png

113 ms

56fdf6afN51350b35.jpg

56fdf6afN51350b35.jpg

143 ms

pageview.php

pageview.php

1328 ms

adjs.php

adjs.php

1212 ms

adx.js

adx.js

650 ms

imp_count.php

imp_count.php

914 ms

imp_count.php

imp_count.php

1109 ms

10592-220904-30455-1

10592-220904-30455-1

29 ms

10592-210883-50046-3

10592-210883-50046-3

30 ms

55e40d3fN2a01189f.png

55e40d3fN2a01189f.png

142 ms

o.htm

o.htm

501 ms

wh.js

wh.js

794 ms

ac.js

ac.js

558 ms

fp.htm

fp.htm

593 ms

Accessibility Review

training.51cto.com accessibility score

70

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Names and labels

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best Practices

training.51cto.com best practices score

75

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

High

Includes front-end JavaScript libraries with known security vulnerabilities

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

General

Impact

Issue

Low

Detected JavaScript libraries

SEO Factors

training.51cto.com SEO score

75

Search Engine Optimization Advices

Crawling and Indexing

To appear in search results, crawlers need access to your app.

Impact

Issue

High

Links are not crawlable

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Image elements do not have [alt] attributes

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document doesn't use legible font sizes

Language and Encoding

  • Language Detected

    ZH

  • Language Claimed

    N/A

  • Encoding

    GB2312

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Training.51cto.com can be misinterpreted by Google and other search engines. Our service has detected that Chinese is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Training.51cto.com main page’s claimed encoding is gb2312. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

training.51cto.com

Open Graph description is not detected on the main page of Training 51 Cto. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: